Perhaps you should try some spelling variations:
7.6.2 communication » 3.3.2 communication, 3.4.2 communication, 4.2.2 communication
test development » forest development, port development, mena development
inflation taxes » inflation rates, inflation tax, inflation targets
technology dlt » technology data, technology debts, technology 21st
development de » development d, development ds, developpement de
dlt inflation » der inflation, die inflation, d inflation
taxes case » states case, ages case, cases case
case 7.6.2 » case 4.6.2, case 1.6.2, case 7.1.2
costs test » costs cost
de afrique » de l'afrique, en afrique, l afrique

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• Adding a wildcard symbol may retrieve word variants: technology dlt inflation taxes case 7.6.2 communication costs test development de afrique.*.